Physics Calculators

Kinetic Energy, Potential Energy, Frequency to Wavelength and Light Travel Time

Calculate the energy of a moving car, a raised weight, an appliance or a gram of matter, convert between frequency and wavelength, and find how long light takes to cross a room, an ocean or the galaxy.

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Speed Of Light Calculator

How long light takes to travel a distance, or how far it goes.

Every Physics tool

Energy Calculator

Kinetic, potential, electrical and mass energy in joules and kWh.

Frequency To Wavelength Calculator

Convert frequency and wavelength for radio, light and sound.

Speed Of Light Calculator

How long light takes to travel a distance, or how far it goes.

Energy, waves and light

The energy calculator puts kinetic, potential, electrical and mass–energy on one scale, in joules, kWh, kilocalories, electronvolts and tonnes of TNT, so you can compare a car crash with a kettle or a nuclear reaction. The frequency to wavelength calculator works for radio, light and sound, naming the radio band or colour and giving the photon energy. The speed of light calculator turns distances into travel times and back, in a vacuum or slowed in air, water, fibre, glass and diamond, which is handy for astronomy homework and network latency alike. Each page shows the formula with your numbers in it, plus a reference table of everyday values.